Finalized Master theses

Número de entradas: 27

Inflation from fluid models

Estado: defended (15/02/2017)
Estudiante: Kerim Demirel
Supervisada por: Sergei D Odintsov ; Emilio Elizalde
Universidad: Universitat Autònoma de Barcelona

Fluid inflation is proposed and studied.
Estado: defended (15/02/2017)
Estudiante: Kerim Demirel
Supervisada por: Sergei D Odintsov ; Emilio Elizalde
Universidad: Universitat Autònoma de Barcelona

Fluid inflation is proposed and studied.

The $J/\Psi$ interaction with nucleons and baryons within a unitarized SU(6)$\times$HQSS meson-baryon model

Estado: defended (24/10/2016)
Estudiante: Elisabet Galiana Baldo
Supervisada por: Laura Tolos
Universidad: Universitat de Barcelona

We present a detailed analysis of the hidden charm sector (i.e. with cc pairs), with C = 0. In particular, we study the interaction between J/Y and nucleons and baryons. For this purpose, we use a theoretical model that has been built in previous works, that is based on a suitable extension of the…
Estado: defended (24/10/2016)
Estudiante: Elisabet Galiana Baldo
Supervisada por: Laura Tolos
Universidad: Universitat de Barcelona

We present a detailed analysis of the hidden charm sector (i.e. with cc pairs),
with C = 0. In particular, we study the interaction between J/Y and nucleons and
baryons. For this purpose, we use a theoretical model that has been built in previous
works, that is based on a suitable extension of the Weinberg Tomozawa term
to include, beside Chiral Symmetry, Spin Flavour Symmetry in the light sector and
Heavy Quark Spin Symmetry in the heavy sector. Within this model we obtain the
interaction between J=1/2+, J=3/2+ baryons and pseudoscalar and vector mesons which
contain light and heavy quarks. We carry out the calculation of some scattering observables,
such as cross sections and scattering lengths, while comparing the results
with other works. Moreover, we analyze the existence of the two new states recently
discovered by the LHCb Collaboration, the P+c (4380) and P+c (4450) pentaquarks.
We find that we can only reproduce one of the state, the Pc(4450) pentaquark, if we
modify considerably the subtraction point.

Modeling and Analysis of the Galaxy Clustering

Estado: defended (18/09/2015)
Estudiante: Anna Maria Porredon Díez de Tejada
Supervisada por: Martin Crocce ; Pablo Fosalba Vela
Universidad: Universitat Autònoma de Barcelona

Splitting the different calculations of a pipeline into interchangeable modular units seems to be a promising method for analyzing samples of data in a large scientific collaboration. Here, we develop a stable code that models the two-point correlation function of galaxies, as this observable is…
Estado: defended (18/09/2015)
Estudiante: Anna Maria Porredon Díez de Tejada
Supervisada por: Martin Crocce ; Pablo Fosalba Vela
Universidad: Universitat Autònoma de Barcelona

Splitting the different calculations of a pipeline into interchangeable modular units seems to be a promising method for analyzing samples of data in a large scientific collaboration. Here, we develop a stable code that models the two-point correlation function of galaxies, as this observable is a powerful tool to derive cosmological constraints. Then, we simulate mock data from this model assuming that the data points are uncorrelated and follow a Poisson distribution centered at the theoretical values. Last, from the expected theoretical values and the mock data, we take a modular approach to perform a Markov Chain Monte-Carlo (MCMC) likelihood analysis on some cosmological parameters. The resulting values of these parameters are in agreement with the true ones used to generate the mock data, thus we conclude that the pipeline is consistent. 

Desarrollo software e integración de un subsistema de medidas magnéticas para cubesat

Estado: defended (22/07/2015)
Estudiante: Rubén Sánchez
Supervisada por: Ignacio Mateos ; Ramos-Castro, J.
Universidad: Universitat Politècnica de Catalunya

The purpose of this project consists on the integration of a measuring subsystem for a cubesat payload in which involves the development of the circuit control software, the flight model physical implementation as well as the design and construction of a magnetic shield.
Estado: defended (22/07/2015)
Estudiante: Rubén Sánchez
Supervisada por: Ignacio Mateos ; Ramos-Castro, J.
Universidad: Universitat Politècnica de Catalunya

The purpose of this project consists on the integration of a measuring subsystem for a cubesat payload in which involves the development of the circuit control software, the flight model physical implementation as well as the design and construction of a magnetic shield.

The Bulk Elemental Composition of Primitive Chondrite and the Sun

Estado: defended (02/02/2015)
Estudiante: Marina Martínez Jiménez
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat de Barcelona

Comparative of the bulk chemical composition among different carbonaceous chondrite groups with ICP-AES and ICP-MS analyses provided by ICE-UCLM (2014), and the Sun, in order to investigate the physical and chemical processes that took place in the protoplanetary disc during the first million years,…
Estado: defended (02/02/2015)
Estudiante: Marina Martínez Jiménez
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat de Barcelona

Comparative of the bulk chemical composition among different carbonaceous chondrite groups with ICP-AES and ICP-MS analyses provided by ICE-UCLM (2014), and the Sun, in order to investigate the physical and chemical processes that took place in the protoplanetary disc during the first million years, when the Sun formed.

Hyperons in strongly magnetized neutron stars

Estado: defended (16/10/2014)
Estudiante: Jorge Lerendegui
Supervisada por: Laura Tolos ; Ramos, A.
Universidad: Universitat de Barcelona

Neutron stars are one of the most exotic objects in the universe. Their mass and radius are object of intense study, both from the observation and theory point of view. Their characteristics are featured by their composition. In this context, it has long been recognized that hyperons should be included…
Estado: defended (16/10/2014)
Estudiante: Jorge Lerendegui
Supervisada por: Laura Tolos ; Ramos, A.
Universidad: Universitat de Barcelona

Neutron stars are one of the most exotic objects in the universe. Their mass and radius are object of intense study, both from the observation and theory point of view. Their characteristics are featured by their composition. In this context, it has long been recognized that hyperons should be included among the components of neutron stars. In addition, several observational results conclude that some neutron stars (magnetars) show strong magnetic fields. In this work we have studied different theoretical models focusing on the effect of hyperons and the role of their couplings in the properties and structure of strongly magnetized neutron stars.

Software PARIS interferometric receiver (SPIR)

Estado: defended (09/10/2014)
Estudiante: Juan Carlos Arco Fernandez
Supervisada por: Serni Ribó
Universidad: Universitat Politècnica de Catalunya

The Earth Observation group at ICE (Institut de Ciències de l'Espai) has accomplished several campaigns aimed to demostrate the PARIS (PAssive Reflexive and Interferometry System) concept. This participation is present in terms of manufacturing new devices and processing the collected data. Due to the…
Estado: defended (09/10/2014)
Estudiante: Juan Carlos Arco Fernandez
Supervisada por: Serni Ribó
Universidad: Universitat Politècnica de Catalunya

The Earth Observation group at ICE (Institut de Ciències de l'Espai) has accomplished several campaigns aimed to demostrate the PARIS (PAssive Reflexive and Interferometry System) concept. This participation is present in terms of manufacturing new devices and processing the collected data. Due to the positive results and innovation trend of the group, it has been proposed the development of a new device: Software PARIS Interferometric Receiver or SPIR. The system consists of 16 antenna elements (8 up-looking and 8 down-looking) with their corresponding RF chains and a recording system in order to test new processing techniques. It has been decided to digitize and record the in-phase and quadrature signals of each 16 elements and perform the digital signal processing by software. Therefore, it is necessary to record such data and time-stamp it accordingly for the post-processing process. This approach will enable to perform digital beam-forming and demostrate new remote sensing concepts. Samples obtained from those antennae must be saved into hard disks in the form of one GPS second files. The sampling rate (80MHz), the number of antennae and components retrieved produce a sustained rate of 320MBytes/s. The presented project is focused in the design and development of the system capable to retrieve, format, tag and store such data in the previously mentioned files. This device, apart from the RF chains, is composed by two major components: Data Acquistion FPGA and PC. The first contains a VHDL based system capable to collect data coming from the RF chains (antennae data and other system measurements) and send it towards, through PCIe connection to the PC. It is also expected to configure the different subsystems in the RF chains accordingly to the configuration transmitted from the PC using a graphical user interface. On the other side, the PC is in charge of request the retrieved data, process and save it into hard disk at the sustained rate of 320MBytes. This task is required to be achieved using the appropriate drivers and a GUI that provides the user of real-time system status data and capability to configure the device.

Software PARIS Interferometric Receiver

Estado: defended (09/10/2014)
Estudiante: Arco-Fernández, J. C.
Supervisada por: Serni Ribó
Universidad: Universitat Politècnica de Catalunya

The present MSc contains the study, design and development of a high speed recorder of the SPIR project. The project aims to study beam-forming capabilities in GNSS-R scientific research, by saving data obtained from two antenna arrays (one on top and another at bottom of an air-plane). The data is to…
Estado: defended (09/10/2014)
Estudiante: Arco-Fernández, J. C.
Supervisada por: Serni Ribó
Universidad: Universitat Politècnica de Catalunya

The present MSc contains the study, design and development of a high speed recorder of the SPIR project. The project aims to study beam-forming capabilities in GNSS-R scientific research, by saving data obtained from two antenna arrays (one on top and another at bottom of an air-plane). The data is to be recorded with GPS time synchronization and formatted for its later data analysis. This document is focused on digital data transmission, formatting and storage into files of said instrument. It provides background information regarding GNSS systems and state of the art information of GNSS-R science. It also provides historical information of the achievements carried out by SPIR's project development team. It continues with SPIR's experiment specifications regarding data management and expected data contents. Synchronization GPS reference time is specially stressed in order to properly align the retrieved data. It details instrument design, architecture and sub-systems. Special attention is given to data flow management from data digitalization until it is stored within a file system. A brief description of the roles performed by system sub-modules along data flow is also provided. Finally, design features are detailed regarding data file format and mechanism to keep track of data transmission.
The description of the  implementation is segmented into three sections describing the FPGA development board, Linux driver and graphical application. All sections begin with research results and decision argumentation for each sub-module within instrument. Information regarding interfaces and data transfer protocols used to exchange data between sub-modules is provided. Finally, it describes the perfomed instrument tests.
 

Magnetic fields analysis in the LISA PathFinder mission

Estado: defended (03/09/2014)
Estudiante: López Zaragoza, J.P.
Supervisada por: Miquel Nofrarias Serra
Universidad: Universitat Autònoma de Barcelona

The main scientific goal of the LISA Pathfinder (LPF) mission is to put two test masses in an almost perfect free fall, and then measure the differential acceleration existing between them. To achieve this objective, new technologies will be tested, and a full characterization of all the sources…
Estado: defended (03/09/2014)
Estudiante: López Zaragoza, J.P.
Supervisada por: Miquel Nofrarias Serra
Universidad: Universitat Autònoma de Barcelona

The main scientific goal of the LISA Pathfinder (LPF) mission is to put two test masses in an almost perfect free fall, and then measure the differential acceleration existing between them. To achieve this objective, new technologies will be tested, and a full characterization of all the sources of noise that exert some kind of force over the test masses is needed. In this work we will present the characterization done for the magnetic noise. In this work, we characterise a set of real data taken from a month of real simulations performed on the LPF spacecraft, where the conditions that the satellit will face once in space were reproduced. We also show the results obtained for the runs performed using the RJMCMC (model selection) and MCMC (parameter estimation) methods. Using a RJMCMC algorithm we concluded that a model consisting in one source (model #1), the simplest one possible, seems to explain well the data, being closely followed by a model consisting in two sources (model #2). The results from the MCMC method allowed us to provide a first of estimate the magnetic moment of the selected sources with their corresponding error.     

Deep phase modulation for homodyne laser interferometry

Estado: defended (11/07/2014)
Estudiante: Terán, M
Supervisada por: Miquel Nofrarias Serra
Universidad: Universitat Politècnica de Catalunya

Gravitational waves were predicted by Albert Einstein as a direct implication of the theory of General Relativity (1915). Although there are compelling experimental evidences of its existence, its detection has not been possible to the date. LISA (Laser interferometer Space Antenna) mission and its precursor…
Estado: defended (11/07/2014)
Estudiante: Terán, M
Supervisada por: Miquel Nofrarias Serra
Universidad: Universitat Politècnica de Catalunya

Gravitational waves were predicted by Albert Einstein as a direct implication of the theory of General Relativity (1915). Although there are compelling experimental evidences of its existence, its detection has not been possible to the date. LISA (Laser interferometer Space Antenna) mission and its precursor mission LISA Pathfinder were designed as a complementary to terrestrial detectors, like LIGO and VIRGO, in order to obtain direct detection of gravitational waves at the frequency range of 100 μHz < f < 0.1 Hz. In this spectral range, the Universe is rich in gravitational waves sources and the sensitivity of terrestrial detectors is severely degraded. This project describes an implementation of homodyne deep phase modulation interferometer in the context of the space mission LISA, which aims to detect gravitational waves through laser interferometry. In order to do so, a laser diode control has been developed, besides an optical bench where the interferometer is implemented. This interferometric technique is based in a pathlength phase modulation of one interferometer arm with a sinusoidal modulation signal. When the interference is obtained, an algorithm, designed as an extension of the "J1 … J4" method is applied in order to extract the phase value from the interfered signal. This technique has been proposed like an alternative to heterodyne interferometry to be used in some subsystems of the LISA mission due to the ability to achieve similar performances transferring complexity from optics to electronics. The study represents a starting point for future implementation of a test bench with a stable environment to develop a deep phase modulation interferometer operative with picometer sensitivity at the desired frequency range. This sensitivity value is the minimum required by LISA mission to detect gravitational waves in the space.
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An institute of the Consejo Superior de Investigaciones Científicas

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